Seeko comes with some useful options to speed up your site loading times.
Fast Loading Photos
Lazy loading your images makes your site faster and this is built-in with Seeko.
Seeko Fast Loading Photos uses a progressive loading method that improves page load performance and aesthetics. See example: https://seeko.seventhqueen.com/dating/blog/
How to customize?
You can switch it on/off from WP admin – Customizer – Seeko options – Performance